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Zoom lens system and an image pickup apparatus including the same

a technology of zoom lens and image pickup, which is applied in the direction of optics, instruments, optical elements, etc., can solve the problems of increasing the degree of accuracy in the production process, increasing the and increasing the overall size of the lens system. , to achieve the effect of increasing the optical performance of the lens system and reducing the overall size of the lens system

Active Publication Date: 2005-12-01
CANON KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0010] At least one exemplary embodiment provides a desired zooming ratio, with the overall size of the lens system reduced, and the optical performance of the lens system increased.

Problems solved by technology

However, when the refractive powers of the lens units are simply increased, the variation in aberration that occurs during zooming also increases.
Thus, it becomes difficult to obtain satisfactory optical performance for the entire zooming range.
Furthermore, the required degree of accuracy in the production process increases, and mass production becomes difficult.

Method used

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  • Zoom lens system and an image pickup apparatus including the same
  • Zoom lens system and an image pickup apparatus including the same
  • Zoom lens system and an image pickup apparatus including the same

Examples

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Embodiment Construction

[0023] The following description of exemplary embodiment(s) is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses.

[0024] Processes, techniques, apparatus, and materials as known by one of ordinary skill in the art may not be discussed in detail but are intended to be part of the enabling description where appropriate. For example lens and lens units are discussed and any material that can be used to form lenses should fall within the scope of exemplary embodiments (e.g. glass, Si). Additionally the actual size of the lens may not be discussed however any size from macro lenses to micro and nano lenses are intended to lie within the scope of exemplary embodiments (e.g. lenses with diameters of nanometer size, micro size, centimeter, and meter sizes). Additionally exemplary embodiments are not limited to visual optical photographic systems, for example the system can be designed for use with infrared and other wavelengths photogra...

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Abstract

At least one exemplary embodiment provides a zoom lens system having multiple lens units (e.g. four) and variable optical power, which's configuration may reduce the size of a zoom lens system. In one exemplary embodiment the zoom lens system can include four lens units, a first lens unit, a second lens unit, a third lens unit, and a fourth lens unit. The lens units can be configured in accordance with at least one exemplary embodiment so that they have various positive and negative optical powers and where the distances between at least two of the lens units changes during a zooming process.

Description

BACKGROUND OF THE INVENTION [0001] 1. Field of the Invention [0002] The invention relates in general to a zoom lens system and more specifically but not exclusively to a zoom lens system used in optical photographic systems. [0003] 2. Description of the Related Art [0004] Recently, image pickup apparatuses, such as video cameras and digital still cameras, including solid-state imaging devices, such as a charge-coupled device (CCD) sensor, have become more sophisticated and smaller in size. Therefore, a photographic optical system included in such a sophisticated and small-sized image pickup apparatus must also have high optical performance and be small in size. [0005] A zoom lens included in a conventional image pick up apparatus has a four-unit structure comprising a first to a fourth lens unit disposed in order from the object side to the image side of the zoom lens system. The first lens unit has a positive refractive power and does not move during zooming and focusing. The secon...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): G02B15/16G02B13/18G02B15/14G02B15/173
CPCG02B15/173G02B15/144113
Inventor HOSHI, KOJI
Owner CANON KK
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